Rapid fall in pressure in heating system - possible causes and solutions

Ein rapid fall in pressure in your heating system can be caused by a number of factors, and it is important to identify the root cause in order to effectively address the issue. In your case, the pressure drops from 1․5 bar to 0 bar within 6 hours, which indicates a significant problem in the system. Here are some possible causes and solutions to consider:

1. Leaks in the system: One of the most common reasons for a rapid pressure drop is leaks in the heating system. Even small leaks can cause a substantial loss of pressure over time. To check for leaks – you can start by isolating different parts of the system. Close off the valves to individual radiators or the underfloor heating system, and monitor if the pressure still drops. If the pressure remains stable – then the leak is likely in the isolated section. You may need to call a professional plumber to locate and fix the leak.

2. Expansion vessel issues: The expansion vessel is responsible for accommodating the expansion and contraction of water as it heats and cools. If the vessel is faulty or not properly charged with air · it may not be able to compensate for the changing water volume · leading to pressure drops. Check the pressure of the vessel and ensure it is set correctly for your system. If it is not – you may need to adjust or replace the vessel.

3. Airlocks: Airlocks can prevent water from circulating properly in the heating system, leading to pressure drops. You can try bleeding air from the radiators or the system as a whole to see if this resolves the issue. If airlocks continue to occur frequently there may be an underlying problem with the system such as a faulty pump or blockages in the pipes, which should be addressed by a professional.

4. Faulty pressure relief valve: The pressure relief valve is designed to prevent the pressure in the system from becoming too high. If this valve is faulty ´ it may release water ` causing a rapid drop in pressure. Inspect the valve for any signs of leakage or malfunction and consider replacing it if necessary.

5. Other issues: There may be other factors contributing to the pressure drop such as a malfunctioning pump a blocked pipe, or a faulty pressure gauge. If none of the above solutions resolve the issue it is recommended to seek assistance from a heating professional who can diagnose and fix the problem.

It is important to note that working on a heating system can be complex and potentially dangerous, so if you are not familiar with the mechanisms or unsure about the solutions mentioned, it is best to consult a qualified professional. They will be able to assess the situation accurately and provide the most appropriate solution for your specific heating system.